<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // person =  {}
      function person() {}
      console.dir(person);
      console.dir(person.prototype);

      // alert()
      console.dir(alert.prototype);
      // console.log
      console.dir(console.log.prototype);
      // JSON.stringify
      console.dir(JSON.stringify.prototype);
      // Date()
      console.dir(Date.prototype);
      // String(123)
      console.dir(String.prototype);
      console.dir(Object.prototype);
      console.dir(Number.prototype);
    </script>
  </body>
</html>
